Re: Intermittent test plan change in "privileges" test on BF animal prion

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Intermittent test plan change in "privileges" test on BF animal prion
Date: 2020-06-09 02:54:40
Message-ID: 2144773.1591671280@sss.pgh.pa.us
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Thomas Munro <thomas(dot)munro(at)gmail(dot)com> writes:
> Two recent failures show plan changes in RLS queries on master.

Yeah. I assume this is related to 0c882e52a, but I'm not sure how.
The fact that we've only seen it on prion (which runs
-DRELCACHE_FORCE_RELEASE -DCATCACHE_FORCE_RELEASE) is suggestive,
but it's not clear why those options would lead to unstable
planner estimates. I've been waiting to see if we start to get
similar reports from the full-fledged CLOBBER_CACHE_ALWAYS critters.

regards, tom lane

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